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Finding the Fourth Proportional to 1,081.53, 1,492.58 and 639.33

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Solution

The fourth proportional to 1,081.53, 1,492.58 and 639.33 is: 882.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.53 : 1,492.58 = 639.33 : x
  2. Step 2: Convert to fraction form
    1,081.53/1,492.58 = 639.33/x
  3. Step 3: Cross multiply
    1,081.53x = 1,492.58 × 639.33
  4. Step 4: Simplify right side
    1,081.53x = 954,247.97
  5. Step 5: Solve for x
    x = 954,247.97/1,081.53
  6. Step 6: Final answer
    x = 882.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.